<?php
function  add($a, $b)
{
  return $a + $b;
}
function get($name){
   return isset($_GET[$name])? $_GET[$name]:'';
}
function post($name){
   return isset($_POST[$name])? $_POST[$name]:'';
}
$a = post('a');
$b = post('b');

$result = add($a, $b);






?>

<form action="" method="post">
  <input type="text" value="<?php echo $a; ?>" name="a"/>+
  <input type="text"  name="b" value="<?php echo $b; ?>"/>=<?php echo $result;
  ?><br/>
  <input type="submit"/>
</form>
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